Apparatus for engraving printing rollers



Dec. 23, 1930 A. TEISSERE ET AL 1,785,883

APPARATUS FOR ENGRAVING PRINTING ROLLERS Filed Nov. 20, 1928 PatentedDec. 23, 1930 ALBERT TEISSER-E AND JEAN TEISSERE, OF ST.-JULIEN, AUBE,FRANCE APPARATUS FOR- ENGPIAVIIG PEINTENG ROLLERS Application filedNovember 20, 1928, Serial No. 320,722,and in France July 4, 1928.

the action of the tool, and particularly at avoiding defects inoperation, notably those due to the inertia of the masses operated.

According to the invention, an improved operating tool and means foroperating same are provided, comprising a pivoted bellcrank lever oflight material carrying an engraving diamond or point on one arm, anarmature in the form of a magnetic disc of very reduced mass actuatingthe other arm, and an electromagnet in the form or a'pot to operate saidarmature.

Further features of the invention may be appreciated from the followingdescription of a preferred form of apparatus in accordance therewithillustrated in the accompanying drawing.

In the accompanying drawing:

Fig. 1 is a longitudinal section, and

Fig. 2 is a plan view, from which some parts are omitted to assistillustration.

Referring more particularly to the drawing, a is a magnet in the form ofa pot with a central core a carrying a solenoid b, the whole beingaccommodated in an aluminium casing provided with adevice 0 for securingit on the engraving machine. In the chamber formed by a cover cl ofnon-magnetic material and the magnet a,'a is disposed an armature e inthe form of a disc, the mass of which is reduced as much as possible,the armature 0 being guided on one side by a shaft f of non-magneticmetal accommodated in the core a and on the other side by a shaft 9passing through the cover 01. A spring h, the tension of which can beadjusted by slackening a holding screw it and sliding a bracket it" upor down a fixed rod h, act- 5 ing on the extension of the shaft 9 at itsat-its upper part a finely adjustable screw m upper end, brings the disc6 bacl; to its positionof rest after each interruption of the current inthe solenoid Z), the air imprisoned between the disc 6 and the cover (Z,as it is more and more compressed by the movement of the disc, havingachecking or dash-pot e ect. The movement of the armature e istransmitted to the tool by means of arbellcrank lever is, Z, of whichthe arm A: carries provided with the engraving diamond i. In order toreduce as much as possible the bad effects of mass inertia, the lever k,Z, through which passes the extension of the shaft g, is formed as atrunnion, which is held between n the shaft 9 and a spring washer n byanut, to prevent all playwhile not impeding its mobility.

We claim: 7

1. In apparatus for electro-magnetically engraving printing rollers: anengraving point and means for operating the same, comprising a pivotedbell-crank lever of light material carrying the engraving point on onearm, an armature in the form of a magnetic disc oi? veryreduced massactuating the other arm, and an electro-magnet in the form of a pot tooperate said armature, the arrangement being such that the disc armatureis received in said electro-magnet.

2. Appantus of the type set forth, comprising a pivoted bell-crank leverof light material, carrying an engraving point on one arm, an armaturein the form of a magnetic disc of very reduced mass connected to theother arm, an electro-magnet in the form of a pot to operate saidarmature and a cover forthe electro-magnet forming a chamber therewithin which said armature disc is enclosed, so that the compression of theim prisoned air by the disc in action may have a dash-pot effect.

3. Apparatus of the type set forth, comprising a pivoted bell-cranklever of light material carrying an engraving point on one arm, anarmature in the form of a magnetic disc of very reduced mass actuatingthe other arm, an electro-magnet in the form of a pot to operate saidarmature, a cover for the electro-magnet forming a chamber therewith inwhich said armature is enclosed, elastic means to return the armature toits position of rest after each interruption of the current in theelectro-magnet and means to adjust the tension of said elastic means.

4-. Apparatus of the type set forth comprising a pivoted hell-cranklever of light material carrying an engraving pointwon one arm, anarmature in the form 01? a magnetic disc of Very reducedmassactuatingthe other arm, an electro-uiagnet in the form of a pot tooperate said armature, a spring to return the armature to its positionof rest after each interruption of the current in the electromagnet,said spring acting on an extension forming part of the armature, asliding bracket to adjust the tension of said spring, means to 'lix saidsliding bracket in a required position, a trunnion forming part of saidhell-crank lever and through which passes said extension of thearmature, and Washers for holding said trunnion between them to preventall play While not impeding the mobility.

In testimony whereof we signed hereunto our names.

ALBERT TEISSERE. JEAN TEISSERE.

